docs: def export(self, version, export_dir):
          """
          Create prov entities and activities.
          """
  
          atts = [
              (PROV['type'], self.type),
              (PROV['label'], self.label),
          ]
  
          if version['num'] == "1.0.0":
              atts += [
                  (NIDM_USER_SPECIFIED_THRESHOLD_TYPE, self.user_threshold_type),
                  (PROV['value'], self.stat_threshold),
                  (NIDM_P_VALUE_UNCORRECTED, self.p_uncorr_threshold),
                  (NIDM_P_VALUE_FWER, self.p_corr_threshold)
                  ]
          else:
              atts += [
                  (PROV['type'], self.threshold_type),
                  (PROV['value'], self.value)
                  ]
  
          if self.equiv_thresh is not None:
              for equiv in self.equiv_thresh:
                  atts += [
                      (NIDM_EQUIVALENT_THRESHOLD, equiv.id)
                  ]
  
          self.add_attributes([(k, v) for k, v in atts if v is not None])